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The BSA A10 series was a range of 646 cc (39.4 cu in) air-cooled parallel twin motorcycles designed by Bert Hopwood and produced by Birmingham Small Arms Company at Small Heath, Birmingham from 1950 to 1963.
A10 Golden Flash: 650 cc 1950 1962 BSA's first 650 cc parallel twin. Known as "Royal Tourist" in the US from 1960 A10 Super Flash 650 cc 1953 1954 Limited edition for homologation for production racing in the USA A10 Road Rocket: 650 cc 1954 1957 Tuned version of "Golden Flash" A10 Spitfire Scrambler 650 cc 1957 1963 Tuned off-road racer (US only)
The BSA unit twins were a range of unit construction twin-cylinder motorcycles made by the Birmingham Small Arms Company (BSA) and aimed at the US market. A range of 500 cc (31 cu in), 650 cc (40 cu in) and 750 cc (46 cu in) twins were produced between 1962 and 1972, [1] but they were really developments of the older pre-unit A7/A10 model range with less weight. [2]
The BSA Road Rocket was a 1950s 646 cc (39.4 cu in) air-cooled parallel twin motorcycle designed by Bert Hopwood and produced by Birmingham Small Arms Company (BSA) at Small Heath, Birmingham. Developed from the A10 Golden Flash it was the first sports bike in the BSA A10 series .
Single-cylinder engine based on the BSA B25 Starfire (not the Tiger Cub. The starfire/C15 was a development of the Tiger cub engine.). T100C Trophy 500 1966-1972 single carb. Mainly for export to the USA TR6 Trophy: 650 1956–1968 Single carburetor model. TR6C Trophy: 650 C is the 'Competition' Model. High pipes on left side.
BSA motorcycles were made by the Birmingham Small Arms Company Limited (BSA), which was a major British industrial combine, a group of businesses manufacturing military and sporting firearms; bicycles; motorcycles; cars; buses and bodies; steel; iron castings; hand, power, and machine tools; coal cleaning and handling plants; sintered metals; and hard chrome process.
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Also in 1954, Ariel launched the FH, a 650cc parallel twin to compete with the Triumph Thunderbird. However, instead of enlarging the KH engine, Ariel used the BSA A10 engine, with a different timing cover to badge-engineer it as an Ariel. [12] Reliable and capable of 100 miles per hour (160 km/h), the FH proved popular with sidecar enthusiasts.